Drum



E. RONNE April 18, 1950 DRUM 2 Sheets-Sheet 1 Filed July 25, 1946 NTOR ATTORNEYS E. RONNE 1 April 18, 1950 DRUM 2 Sheets-Sheet 2 Filed July 25, 1946 INVENTOR ATTORN EYS Patented Apr. 18, 1950 Application July 25, 1946, Serial No. 686,258

In Denmark December 22, 1944 Section 1, Public Law 690, August 8, 1946 Patent expires December 22, 1964 8 Claims.

This invention relates to apparatus for the treatment of solids and slurries with gases for the purpose of efiecting heat exchange or causing chemical changes. More particularly, the invention is concerned with a novel rotary drum for the purpose mentioned which is constructed to provide a plurality of lengthwise passages defined by partition means which serve the additional purpose of stifiening the drum shell and preventing its deformation under load. By the use of the partition means for stiffening purposes, it is possible to make the drum of relatively thin metal stock, so that the weight of the drum is greatly reduced and it is less expensive to build.

The drum of the invention may be used for the heating of materials in pulverulent, nodular, or slurry form, as in the preliminary heating operations in the production of cement, for drying coal, lignite, peat, etc., and for other purposes. As it may be employed to advantage when mountedin overhanging relation at the intake end of a rotary cement kiln forpreheatin-g of the cement raw materials, an embodiment of the invention in that form will be illustrated and described for purposes of explanation.

At the present time, drums having internal partitions and used for heating materials are made in large sizes, and, when such a drum is mounted in overhanging position, the drum is subjected to strong forces tending to deform it and resulting from the weight of the drum, partitions, and load. In order to restrict the deformation of the drum within suitable limits, it has been the practice to make the drum of plate stock sufliciently heavy to give the drum the desired rigidity, although one or more outside rings are often used to stiflen the drum. The partitions within the drum serve to improve the heat exchange but do not contribute toward the rigidity of the drum or its resistance to deformation. Because of its great weight, such a drum is expensive to construct.

The present invention is directed to the provision of a rotary drum for the purposes above described, which is much lighter in weight than prior drums and is thus less expensive to construct and to operate. In the new drum, the required rigidity is not provided entirely by the drum wall as in prior constructions, but, instead,

2 the drum has internal partitions which are so constructed as to stiflen and support the drum wall. A central rigid body, which may be a tube of small diameter relative to the drum and extending axially of the latter, is mounted within the drum and the walls forming the partitions radiate from the tube. In addition, arcuate pariitions extend between the radial partitions and the construction is such that the partitions are subjected to tensile stresses and may, accordingly,

be of relatively light weight.

For a better understanding of the invention, reference may be had to the accompanying drawings, in which:

Figs. 4 and 5 are sectional views on the lines- 4-4 and 5-5, respectively, of Fig. 1; and

Fig.- 6 is a fragmentary transverse sectional view of a modified construction.

The apparatus illustrated in Fig. 1 includes a rotary kiln III of conventional construction which comprises a shell II with the usual lining l2. A tire l3 encircles the shell near one end and runs on rollers id or slide shoes. At its intake end, the kiln is formed with an outwardly directed radial flange I5, against one face of which are mounted supporting members lifor the drum ll.

The drum includes a shell of relatively light stock, which extends over the edge of flange l5 and is secured by suitable means to the members It. At its free end. the shell has a conical section l8, which extends to an intake sect-ion I9 of a diameter substantially less than that of the shell. A rigid tube 20 of relatively heavy stock extends axially through the main part of the shell and the end of the tube facing the intake section of the drum is closed by a plate 2|. A plurality of imradial partitions-22, and a radial partition 2| extends outwardly from the median line of the outer surface of each arcuate Partition member 28 to the inner surface of theshell l'l. Each arcuate partition member 24 extends from one of the radialpartitions 22tooneoftheradialpartitlona 2|.

The various partition members may be secured in place in any desired manner, as, for example, angle irons 28 maybe secured in pairs to the outer surface of tube 20 by bolting, riveting, or welding, and the inner edge of each partition member 22 may be received between a pair of such angle irons and rigidly secured in place. The outer edge of each partition 22 may be secured in the same manner to the inner surface of shell I1. The arcuate partition members 22 may have edge flanges 23a secured to partitions 22, and the arcuate partition members 24 may have similar flanges 240 secured to partitions 22 and 25. The partitions 25 are then secured between pairs of angle irons 21 and 28 attached, respectively, o the outer surfaces of partition members 22 and the inner wall of the shell II. In sections of the shell which become highly heated, the edges of partitions lying between pairs of angle irons are not rigidly attached to the latter, so that relative expansion of the parts is permitted.

At their intake ends, the arcuate partition members 23, 24 are provided with radial flanges r 2!, and a flight section 30 is mounted on the concave surface of each arcuate partition member inward from the flange. Each of the radial partitions 22, 25 is provided with an extension 3i beyond the flanges 29 and the extension isformed with a lateral flange 32 which terminates in a portion 32a extending along the inner surface of shell I! and having the form of a section of a flight. With this construction, material introduced into the shell through the intake section It slides down the interior of the conical section it to land upon the inner surface of the main section of the shell in front of the flight sections 32a. As the shell rotates, the material is gu.ded by the flight sections to the extensions 2| and moves radially inwardly along those extensions to be discharged in the passages. Within each passage,

the material is prevented from backing up by the fli ht section 30.

At the outlet end of the shell, the arcuate partition members 23, 24 extend beyond the radial partitions and the extensions are provided with inward radial flanges 33 and have spaced openings from which discharge spouts 34 extend radially outwardly. The spouts from the extensions from the arcuate partition members 23 lead to the inner surfaces of the extensions from the arcuate partition members 24, and the spouts from the extensions from the members 24 discharge upon the inner surface of the shell. A plurality of scoops 35 are mounted within the shell along the flange i5 and, as the shell rotates, material discharged from the spouts is picked up by the scoops and discharged into the interior of the kiln.

With the contruction described, the light partitions together with the rigid central tube 20 impart such rigidity to the shell that it may be made of relatively light stock and, while the tube 20 is thick-walled, its weight is not comparable with the saving in weight resulting from the use of light material for the shell. The complete drum structure is, accordingly, much lighter in weight than prior similar drums.

I claim:

1. A drum for use in the treatment of solids and slurries with gases which comprises a cylindrical shell, a rigid member within the shell and extending coaxially thereof, a set of angularly spaced radial plates extending between the outside of the member and the inner surface of the shell, an inner continuous series of arcuate plates connecting the radial'plates and together forming an inner cylindrical partition enclosing and spaced from the member, a second set of radial plates extending from the inner surface of the shell to the outer surface of respective arcuate plates only, and an outer continuous series of arcuate plates connecting the radial plates of the two sets and forming an outer cylindrical parti- -tlon lying between the shell and the first partition, the arcuate and radial plates extending lengthwise of the drum and terminating short of the ends thereof and the spaces between the member and the inner partition, between the partitions, and between the outer partition and the shell being divided by the radial plates into three concentric series of passages extending lengthwise of the drum and open at both ends, the material to be treated and the gases traveling through the passages as the drum is rotated on its longitudinal axis.

2. A drum for use in the treatment of solids and slurries with gases which comprises a cylindrical shell, a rigid member within the shell and extending coaxially thereof, a set of angularly spaced radial plates extending between the outside of the member and the inner surface of the shell, an inner continuous series of arcuate plates connecting the radial plates and together forming an inner cylindrical partition enclosing andspaced from the member, a second set of radial plates extending from the inner surface of the shell to the outer surface of respective arcuate plates only, an outer continuous series of arcuate plates connecting theradial plates of the two sets and forming an outer cylindrical partition lying between the shell and the first partition, the arcuate and radial plates extending lengthwise of the drum and terminating short of the ends thereof and the spaces between the member and the inner partition, between the partitions, and between the outer partition and the shell being divided by the radial plate into three concentric series of passages extending lengthwise of the drum and open'at both ends, the material to be treated and the gases traveling through the passages as the drum is rotated on its longitudinal axis, and scoops mounted on the ends of the radial plates at one end of the drum, the scoops having intake ends adjacent the shell and leading to the respective passages.

3. A drum for use in the treatment of solids and slurries with gases which comprises a cylindrical shell, a rigid member within the shell and extending coaxially thereof, a set of angularly spaced radial plates extending between the outside of the member and the inner surface of the shell, an inner series of arcuate plates connecting the radial plates and together forming a cylindrical partition enclosing and spaced from the member, a second set of radial plates extending from the inner surface of the shell to the outer surface of respective arcuate plates only, an outer series of arcuate plates connecting the radial plates of the two sets and forming a cylindrical partition lying between the shell and the first partition, the radial plates subdividing the spaces between the member and the first partition, be-

tween the partitions, and between the second partition and the shell into a plurality of passages, which are open at both ends and through which the material to be treated and the gases travel as the drum is rotated on its longitudinal axis, radial flanges mounted on the ends of the cylindrical partitions at one end of the drum, openings through each partition adjacent the flange thereon, and spouts attached to the outer sides of the partitions and leading from the openings.

4. A drum for use in the treatment of solids and slurries with gases which comprises a cylindrical shell, a rigid member within the shell and extending coaxially thereof, a set of angularly spaced radial plates extending between the outside of the member and the inner surface of the shell, an inner series of arcuate plates connecting the radial plates and together forming a cylindrical partition enclosing and spaced from the member, a second set of radial plates extending from the inner surface of the shell to the outer surface of respective arcuate plates only, an outer series of arcuate plates connecting the radial plates of the two sets and forming a cylindrical partition lying between the shell and the first partition, the radial plates subdividing the spaces between the member and the first partition, between the partitions, and between the second partition an the shell into a plurality of passages, which are open at both ends and through which the material to be treated and the gases travel as the drum is rotated on its loneltudinal axis, radial flanges mounted on the ends of the cylindrical partitions at one end of the drum, openings through each partition adjacent the flange thereon, and spouts attached to the outer sides of the partitions and leading from the openings, the spouts from the inner partition discharging on the outer partition inward from its flange and the spouts from the outer partition terminating short of the inner surface of the shell.

5. A drum for use in the treatment of solids and slurries with gases which comprises a cylindrical shell, a rigid tube within the shell and extending coaxially thereof, the tube being blocked, a set of angularly spaced radial plates extending between the outside of the member and the inner surface of the shell, an inner continuous series oj/arcuate plates connecting the radial plates and together forming an inner cylindrical partition enclosing and spaced from the member, a second set of radial plates extending from the inner surface of the shell to the outer surface of respective arcuate plates only, and an outer continuous series of arcuate plates connecting the radial plates of the two sets and forming an outer cylindrical partition lying between the shell and the first partition, the arcuate and radial plates extending lengthwise of the drum and terminating short of the ends thereof and the spaces between the member and the inner partition, between the partitions, and between the outer partition and the shell being divided by the radial "plates into three concentric series of passages extending lengthwise of the drum and open at both ends, the material to be treated and the gases traveling through the passages as the drum is rotated on its longitudinal axis.

6. A drum for use in the treatment of solids and slurries with gases which comprises a cylindrical shell, a rigid member within the shell and extending coaxially thereof, a set of angularly spaced radial plates extending between the outside of the member and the inner surface of the shell, an inner .series of arcuate plates connecting the radial plates and together forming a cylindrical partition enclosing and spaced from the member, a second set of radial plates extending from the inner surface of the shell to the outer surface of respective arcuate plates only, an outer series of arcuate plates connecting the radial plates of the two sets and forming a cylindrical partition lying between the "shell and the first partition, the radial plates subdividing the spaces between the member and the first partition, between the partitions, and between the second partition and the shell into a plurality of passages, which are open at both ends and through which the material to be treated and the gases travel as the drum is rotated on itslongitudinal axis, the radial plates extending beyond the arcuate plates at one end of the drum, flanges along the projecting edges of the radial plates, and helically directed plates connected to the outer edges of the flanges extending along the inner surface of the shell.

'7. A drum for use in the treatment of solids and slurries with gases which comprises a cylindrical shell, a rigid member within the shell and extending coaxially thereof, a set of angularly spaced radial plates extending between the outside of the member and the'inner surface of the shell, means on the outer surface of the member and the inner surface of the shell for confining said plates against angular displacement relative to the shell and member while permitting edge-. wise movements of the plates, an inner continu-" ous series of arcuate plates connecting the radial plates and together forming an inner cylindrical partition enclosing and spaced from the member/a second set of radial plates extending from the inner surface of the shell to the outer continuous surface of respective arcuate plates only, and an outer series of arcuate plates connecting the radial plates of the two sets and forming an outer cylindrical partition lying between the shell and the first partition, the arcuate and radial plates extending lengthwise of the drum and terminating short of the ends thereof and the spaces between the member and the inner partition, between the partitions, and between the outer partition and the shell being divided by the radial plates into three concentric seriesof passages extending lengthwise of the drum and open at both ends, the material to be treated and the gases traveling through the passages as the drum is rotated on its longitudinal axis.

8. A drum for use in the treatment of solids and slurries with gases which comprises a cylindrical shell, a rigid member within the shell and extending coaxially thereof, a set of angularly spacedmradial plates extending between the outside of the member and the inner surface of the shell, a plurality of series of arcuate plates connecting the radial plates and together forming cylindrical partitions concentric with and enclosing and spaced from the member, and other radial plates extending from the inner surface of the shell inwardly to the outer surfaces of certain of said arcuate plates and lying between the radial plates of said set, the arcuate and radial plates extending lengthwise of the drum and terminating short of the ends thereof, and said arcuate and radial plates dividing the space within the drum between the shell and said member into a plurality of concentric series of passages extending lengthwise of the drumand open at both ends, the material to be treated and the 7 gases traveling through the passages as the drum rotgbesonlts longitudinal a EINAR RGNNE.

REFERENCES CITED The following references are of record in the tile 01 this patent:

UNITED STATES m'mmts Number Name Date- 803,056 Gordon Oct. 31, 1905 1,048,763 Tledtke Dec. 31, 1812 Number 10 Number- 8 Name Date Eldred. Aug. 28, 1917 Hillel'- Aug. 25, 1925 Luther Mar. 24-, 1931 Palmer. Nov. 28, 1933 Kroeptle Sept. 11, 1934 lchtenberg efia1. July 25, 1939 Fomcm PATENTS Country- Date Germany Oct; 1, 1901 

